Excavating for concrete piles, &amp;c.



PATENTED Nov. 26, 1907.

- W: J. STEWART. 'EXOAVATING FOR CONCRETE PILES .APPLICATION FILED JUNE Z5. 1907.

2 SHEETS-SHEET 1.

ATTORNEYS f No. 872,093. lATENTED NOV. 26. 190? W. J. STEWART.

EXCAVATING FR UONCRETE PILES, 650. APPLICATION Hmm JUNE 25. 1907.

WILLIAM JOHN STEWA-RT, OF BELFAST, IRELND.

EXCAVATING- FOR CONCRETE PILES, cc.

Specification of Letters Patent.

Patented Nov. 26, 1907.

Application filed Julio 25.1907. Serial 110.380,761.

, To all whom it may concern:

' Be it known that I, WILLIAM JOHN STEW- ART, of Ormeau lRoad, Belfast, in the county of Down, f"`reland,'building and engineerin contractor, have invented. certain new and useful Improvements in Excavating for Concrete Piles and other Such Work, of which the following is a specification.

l.This invention has reference to improvements `in excavating for concretevor other iles, well sinking and other work of a similar lind, such as the sinking of ca'ssons, excavatingshafts, and for mining and many other purposes, `and consistsessentially in driving through the. material a tube with a suitable cutting edge, and :fitting within same an innertuzbe to receive the excavated material, as it is dislodged by the sinking of the outer tube by percussive or other action, and discharging saine by the l'ithdrawal of said inner tube periodically or otherwise as found most suitable. When the hole has been 4sunk to aifsutlicient depth, the inner tube is withdrawn and, if a concrete pile to be formed,

' understand same, I have hereunto a the liquid concrete is poured into the outer ltube. Before `the concrete has set, this tube .is removed and may be readily cleaned for use in another' excavation.

In order that others skilled in the art to which my invention relates may properly ppended two sheets of illustrative drawings in which Figure 1 is an inverted plan and Fig. 2 an elevation partly in section of the lower end of the outer tube. Fig. 3 is a sectional plan on .the line 3-2-3 in Fig. 4 which is a sectional ele vation, r showing vthe inner tube with contractedanouth within the outer tube. Fig. 5 is also a sectional plan on the line 5--5 in Fig. -showing the inner tube with a di'l'l'erent form of'contractcd mouth. li" ig. is an elevation of the, lower end ot the inner tube fur-` nished with jaws shown: also at right angles ,inliig `8 which is a sectional elevation of the lower ends of both tubes. Figs. tl and 12 are elevationspartlyinsectionof the lower ends ot Athe outer and inner tubes illustrating modified arrangements for elfecting the same object of contracting the entrance to the lower end of the inner tube, while Figs. i() and 13 are inverted plans of the lower end of the inner tube correspondimr to Figs. 9 and l12 and Figs. 11 and 14 show etails.

Ihe outer tubo 1 to be driven into the soil or other material is fitted at its lower end with a circumferential shoe i2 or chisel cutting edge riveted or otherwise secured to it.,

This consists oi a steel or other metal ring 2 angled downwards and inwards or only angled one way from its greatest circumference to form a cuttingy edge 3 and checked or formed with a shoulder 4 on its inner surface to form an abutment f or the lower end of the tube l and also, for a check or shoulder 5 on the lower art ol the inner tube 6, and as shown in llig. 4 having a second .check or shoulder 7 formed near its lower edge to fornil abutment for the lower end of the inner tube 6, and prevent the excavated material getting between 'tbc tubes. The lower end of the ring 2 is also angled inwards and upwards to )roduce a 4'good cuttinor edge. lior excavating through hard ground, clay or other material, such as sandstone or other mineral, the lower end or cutting edge 3 of the outer tube is preferably furnished with conical pointed teeth S at spaced distances apart around the' cutting edge 3' but these teeth may be dispensed with for other work. The inner tube which fits loosely within the outer tube 1 is made in two longitudinal halves. the adjacent edges of the halves being formed with. checks, as indicated at`9 in F ig. 3, to allow ofa little play o1' expansion and contraction of the inner tube to tighten on and grip the material. The inner tube, may however be made in one if desired.

As illustrated by Figs. 8 and thc lower end of the inner tube is formed of airing l() either in one or two partswhich is riveted or otherwise secured to it. This ring 10 is checked ou its outer surface to abut onr the. checks or shoulders -l and 7 of the outer tube t and is 'formed with a curved swellol projection all round to -providc a' contracted mouth, which may be varied to suit the inatcrial being excavated. As the material is excavated ii passes up through the contracted mouth and is held by it within the inner tube 6 while. that is being withdrawn by chains attached to its upper end. or by any suitable means, to be emptied. '.lo cause the two halves ol' the inner tube (i, when so Constructed, to compress and grip the cxcavatcd material, levers or lurks 11 are jointed to their inner surfaces near the lower end, the other ends of which links are connected to a redit), or it may b'e a chain or other means, as shown in Fig. 4, so that when being drawn up the two halves are drawn together and grip the material between th' .11. The cavity so excavated may be filled in with concrete ing notches'l formed ingits lower edge corresponding to the projections 12, is passed down to the bottom of the inner tube and is there given a slight turn to loclf; it and prevent it rising with the excavated material. This nozzle 13 rests upon a ledge or shoulder 15 atthe lower end of the inner tube 6. More than one conoidal tube i3 may be used withiny the inner tube 6 at distances apart if desired, and their angle of inclination may be varied to suit the circumstances. As illustrated by Figs. 7 and 8 instead oi' making the inner rtube 6 in two longitudinal parte, its lower end only so formed as-a pair of -iaws l5 jointed to it by hinges 117, and connected by the levers or links l1 to the rod i9, or it may b c a chain, by which the jaws are made to close on the material. The open positionis shown by the dotted lines in Fig. 7. Quadrant shaped plates 1S are secured to the upper part of the jaws to close any opening between them and 'the end cf the inner tube 6.

1instead of forming or fitting the lower end of the inner tube 6 with a contracted mouth or closing jaws to retain the excavated mae terial, as shown in Figs. to il itis provided with a cross bar or plate 2G, or it vmay be more than one, passing iromside to sideat the bottom and formed as a knife edge 2l below and a broader part above to support the material. To support. the bar 20 in position two rings 22 and the lower end oi the tube 6 and 'the flat ends 2e of the bar are entered through the openings 25 and then turned in the space between the rings 22 and 23 to the position shown.

Portable and interchangeable ends having a variety of arrangements of crossV bars may be provided so that the variety appropriate to the soil or material being worked may be secured to the lower end ci the inner tube.

As illustrated by Figs. 12 vto 14 bars 2() in *.cruciform shape are made in one with a ring .28 having projections 26 which are entered into the bayonet goint slots 27 to be held securely in position, and any variety of such portable ends may be provided.

23 are secured within eraclea The excavated material maybe discharged from the tube by withdrawing the'bars When these are inserted singly, or by removing the ends when these. are made portable and interchangeable.

lll/That I claim as my invention and desire to secure by Letters Patent is as follows 1..ln excavating for concrete piles, and other such work, the combination comprising an outer sinking tube provided with a cut# ting-Shea@desinner tubaiave and periodically discharge theexcavate'dinaterial, substantially as set forth.

2. .ln excavating for concrete piles, and other such work. the combination comprising an outer sinking tube provided with a cut ting shoe and an inner tube having its lower end contracted, to receive and periodically discharge the excavated material', substantially as set forth.

3. ln excavating for-,concrete piles,v and other such Work, the combination comprising an outer sinking tube provided .with a cut-4 ting shoe, having a lower sharp cutting edge and an inner annular shoulder, to sup ort an inner tube to receive and periodica ly discharge the excavated material, substantially as set forth. g r

4. In excavating for concrete piles and other such work the combination or an outer sinking tube, provided with a cutting shoe formed with ,a lower sharp cutting'edge and pointed teeth, andan inner tube, to receive and )eriodically discharge the excavated materiai, substantially aaset forth.

v5. .ln excavatingfor concrete' piles, and other such work, the combination comprising an cuter sinning tube, provided with a cutting shoe, and an inner tube, Yto receive'and periodically discharge the excavated material, having its lower end contracted by the insertion of/a bar or bars formed as a knife edge belowl substantially as set forth.

6. In excavating for concrete piles, and

other such work, the combination comprising an outer sinking tube,'provided with a cutting shoe, and an inner tube, to receive and periodically'discharge the excavated material, 'fitted with portable and interchangeable ends formed of bars with knife edges belowA substantially as set forth:

ln;testimony whereof I have signed my two'subscribirig witnesses.

, WILLIAM JOHN STEWAR'I..

`Wi tnesses z EDWARD HARVEY,

THOMAS LAMB MOORE.

name to this specification, in the presence of 

